FoldAR® Sentinel
The FoldAR Sentinel—with its 7.5″ or 9″ barrel and suppressor installed, or an unsuppressed 12.5″ barrel—combined with SB Tactical’s HBPDW pistol brace, has an overall folded length under 14″, making it one of the most concealable and configurable full-capabilities weapon systems available today. With its quick-change barrel system capability and unprecedented concealability, FoldAR produces the
One Rifle to Rule Them All.
Maintains Zero After Every Fold
The patented FoldAR locking system ensures repeatable alignment every time the rifle is deployed. Optics retain zero through repeated folding cycles — eliminating the need for re-zero after transport.
General Specifications
- NFA?
- non-NFA
- Configuration
- Pistol
- Deployment Speed
- Less than 3 Seconds
- Barrel Length
- 7.5" 9.0" 12.5"
- Caliber
- 5.56x45 NATO (.223 Wylde) .300 BLACKOUT
- Overall Length
- 23-1/2"-27-1/2"
- Folded Length
- 13-3/4"
- Weight
- 5.6-6.0 lbs
Barrel System Specifications
- Barrel Material
- 4150 Cold Hammer Forged
- Barrel Coating
- QPQ Melonite
- Barrel Twist
- 1:7 (5.56x45 NATO) 1:7 (.300 Blackout)
- Muzzle Threads
- 1/2"-28 (5.56x45 NATO) 5/8"-24 (.300 Blackout)
- Muzzle Device
- A2 Compensator (1/2"-28) A2 Compensator (5/8"-24)
- Gas System Length
- Pistol Carbine
- Gasblock
- Fully Adjustable (.750" Diameter)
- Bolt Carrier Group
- MilSpec Black Nitride
Chassis Specifications
- Chassis Material
- 7075-T6 Aluminum (Forged)
- Finish
- MIL-A-8625 (T3/C2 Anodized)
- Rail Configuration
- Magpul M-Lok
- Lower Receiver
- FoldAR® - CCR
- Trigger
- Nickel Match PTFE (Single-Stage 5.5lbs)
- Stock/Brace
- SB Tactical HBPDW Pistol Brace
- Grip
- B5 P-Grip 23
- Magazine
- Lancer Hybrid 20rd Lancer Hybrid 30rd
Performance at a Glance
Accuracy:
Sub-MOA Capable With Match Ammunition
Deployment:
Ready To Fire In Under 3 Seconds
Concealment:
Folds To Under 14" - Backpack Ready
Effective Engagement - 7.5" 5.56x45:
250m
Effective Engagement - 7.5" 300BLK:
300m
Effective Engagement - 7.5" 7.62x39:
(N/A) 300m
Effective Engagement - 9" 5.56x45:
300m
Effective Engagement - 9" 300BLK:
400m
Effective Engagement - 9" 7.62x39:
(N/A) 350m
Effective Engagement - 12.5" 5.56x45:
500m
Effective Engagement - 12.5" 300BLK:
500m
Effective Engagement - 12.5" 7.62x39:
(N/A) 450m
Engineered Under Stress
Every Watchman platform undergoes extensive thermal and structural testing to ensure reliability under sustained fire and extreme operating conditions.
Standard Extension Stress Plot
Thinner wall geometry concentrates stress at the extension lugs, producing higher localized stress under identical loading conditions and increasing fatigue exposure.
FoldAR Extension Stress Plot
The FoldAR tapered extension incorporates a thicker wall section at the lug interface, reducing peak stress concentration and shifting load away from critical areas.
Heart of the FoldAR System
At the core of every FoldAR is a patented folding-barrel interface engineered at the barrel-to-receiver junction—the strongest, most repeatable location possible. This is where accuracy is won or lost, and why FoldAR performs like a fixed-barrel rifle when it matters most.
The same interface enables tool-less barrel and caliber changes in seconds, allowing One Rifle to adapt to multiple roles without sacrificing alignment, reliability, or return-to-zero... while adding additional strength where it matters most.
No tools. No loss of zero. No compromises.
One Rifle—engineered to do more.
Configure your FoldAR® Sentinel
Highly Recommended Duty Grade Accessories
Delivers in: 15-30 Days
Delivers in: 30-45 Days (Proof Research Upgrade)
Guaranteed Safe Checkout